function index = TournamentSelection(K,N,varargin)

%------------------------------- Copyright --------------------------------
% Copyright (c) 2025 BIMK Group. You are free to use the PlatEMO for
% research purposes. All publications which use this platform or any code
% in the platform should acknowledge the use of "PlatEMO" and reference "Ye
% Tian, Ran Cheng, Xingyi Zhang, and Yaochu Jin, PlatEMO: A MATLAB platform
% for evolutionary multi-objective optimization [educational forum], IEEE
% Computational Intelligence Magazine, 2017, 12(4): 73-87".
%--------------------------------------------------------------------------

    if K > 1
        varargin = cellfun(@(S)reshape(S,[],1),varargin,'UniformOutput',false);
        [~,rank] = sortrows([varargin{:}]);
        [~,rank] = sort(rank);
        Parents  = randi(length(varargin{1}),K,N);
        [~,best] = min(rank(Parents),[],1);
        index    = Parents(best+(0:N-1)*K);
    else
        index = randi(length(varargin{1}),1,N);
    end
end